Conference Proceedings National Telesystems Conference 1993

16-17 June 1993

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Displaying Results 1 - 25 of 45
  • The RADARSAT remote sensing ground station for McMurdo station, Antarctica

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (37 KB)

    Summary form only given. Under a memorandum of agreement with the Canadian Space Agency and NOAA, NASA has agreed to construct a remote sensing station and deploy it at McMurdo Base in Antarctica. The station is designed to receive the downlinked data from RADARSAT and to provide for future remote sensing applications on the Antarctica continent. The system, which was designed to meet the special ... View full abstract»

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  • A large W-band slotted waveguide array

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (36 KB)

    Summary form only given. Slotted arrays at millimeter-wave frequencies play an important role in commercial applications such as collision radars and synthetic vision systems. The authors describe the design, fabrication and testing of a 3-ft-long slotted waveguide array having 600 edge wall slots. The design represents a low-loss technique for achieving a high-resolution pattern and uses a standa... View full abstract»

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  • A GPS solution to precision approach and landing (even in the presence of anti-spoofing)

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (64 KB)

    Summary form only given. The ability to track quality dual-frequency P-code (code and phase) observables has been responsible for many exciting developments in global positioning system (GPS) geodesy and precision navigation. However, civilian users were confronted with the fact that P-code quality tracking will essentially disappear when the government enacts full time anti-spoofing (AS). A propr... View full abstract»

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  • INTELSAT VIII; INTELSAT's next generation satellite

    Publication Year: 1993
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (74 KB)

    Summary form only given. The authors present a general overview of the design and key features of Intelsat's next-generation satellite, INTELSAT VIII. INTELSAT VIII will provide both C-band and Ku-band services through a complex antenna system. The 3700-kg spacecraft is based on the GE Series 7000 platform currently in production and is expected to provide over 13 years of in-orbit operational ser... View full abstract»

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  • Prospects for international TVRO growth

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (31 KB)

    Summary form only given, as follows. With the introduction at the end of 1993 of the high EIRP INTELSAT VII/VIII-A satellites, the INTELSAT network is about to enter a new phase of dramatically increased capability. Voice, data and video services will become practical on global scale to much smaller ground terminals than ever before. A similar situation occurred in the United States in the late 19... View full abstract»

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  • Externally modulated optical analog links for microwave applications

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (37 KB)

    Summary form only given, as follows. Fiber-optic analog links using external modulators are useful for microwave applications. They can transmit microwave signals over distances up to several kilometers with low loss and negligible dispersion. With the addition of a few more components, these links can be used in phased array antennas to steer the beam and to provide broadband adaptive nulling. Th... View full abstract»

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  • Proceedings of 1993 IEEE National Telesystems Conference

    Publication Year: 1993
    Request permission for commercial reuse | PDF file iconPDF (96 KB)
    Freely Available from IEEE
  • Applications of the global positioning system to intelligent vehicle highway systems

    Publication Year: 1993, Page(s):139 - 141
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    The Intelligent Vehicle Highway System (IVHS) program is aimed at reducing traffic congestion and motor vehicle emissions, and at improving highway safety, by applying advanced communications and computer technologies. The author examines the user requirements and system functions contemplated for IVHS, and discusses the surveillance and navigation services that are required to support them. Compa... View full abstract»

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  • Performance of coded QPSK modulation for the delivery of MPEG-2 stream compared to analog FM modulation

    Publication Year: 1993, Page(s):121 - 125
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    The author compares the performance of coded quadrature phase-shift keying (QPSK) and analog frequency modulation (FM) for the delivery of video services by satellite. The proposed digital video scheme uses the Motion Picture Experts Group (MPEG-2) video compression with a concatenated coding. The performance of both systems is compared. The digital video scheme is shown to be more robust in noise... View full abstract»

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  • The ARINC veracious differential reference station concept and status

    Publication Year: 1993, Page(s):143 - 152
    Cited by:  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (764 KB)

    An important aspect that must be considered in the design of any differential global positioning system (DGPS) is the degree of integrity inherent in the differential corrections provided by that system. Currently available DPGS systems provide only partial integrity due to one or more of the following reasons: they are restricted to single operating mode integrity, they are capable of failure det... View full abstract»

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  • Precision approach radar (PAR)-remote operation feasibility study

    Publication Year: 1993, Page(s):197 - 201
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    It has been determined that it is feasible to have remote displays and controls of the AN/FPN-63 precision approach radar (PAR) over a narrow bandwidth communication link. The system design maintains the functional requirements of the current radar as required by the applicable air traffic control documents. After processing, one or two dedicated 56 kb/s telephone lines are able to transmit the 4-... View full abstract»

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  • On adaptive arrays in mobile communication

    Publication Year: 1993, Page(s):55 - 58
    Cited by:  Papers (3)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    The author studies the use of adaptive arrays in mobile communication for increasing channel capacity as well as reducing co-channel interference. Antenna arrays may be used at the base station and/or at the mobile unit. A mathematical model for the received signal is presented and discussed in the context of frequency division multiple access (FDMA), time division multiple access (TDMA) and code ... View full abstract»

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  • Transportable orbital tracking, telemetry and command system

    Publication Year: 1993, Page(s):241 - 249
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    NASA/Goddard Space Flight Center has implemented an automated ground-based telemetry, command, and Doppler system. Its function is to support the low-earth-orbiting satellite and sounding rocket programs. This fully transportable system can be configured with the capability to provide unmanned satellite support for seven days or operator augmented automated sounding rocket launch and tracking supp... View full abstract»

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  • MMW technology for enhanced situation awareness/enhanced vision systems

    Publication Year: 1993, Page(s):97 - 99
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    Millimeter wave (MMW) radar systems are now demonstrating the ability to image airport environments in fog. The authors discuss the use of MMW radar technology to provide pilots with enhanced vision and enhanced situation awareness. One of the first steps in providing an autonomous aircraft is the Enhanced Vision System (EVS). This system consists of a heads-up display (HUD) and an imaging MMW rad... View full abstract»

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  • Receiver frequency resolution for range resolution in homodyne FMCW radar

    Publication Year: 1993, Page(s):169 - 173
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    The author presents an analysis and simulation results relating the range resolution to the receiver frequency resolution in a linear frequency modulated, continuous wave, (FMCW) homodyne radar. He considers the relationship between range resolution and receiver frequency resolution for systems that use the fast Fourier transform (FFT) to form multiple frequency and range bins. A millimeter wave (... View full abstract»

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  • A 45-Mbits/sec. VLSI Viterbi decoder for digital video applications

    Publication Year: 1993, Page(s):127 - 130
    Cited by:  Papers (3)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The author describes the unique architecture and feature set incorporated into the STEL-2060 Viterbi Decoder, a VLSI device designed by Standford Telecom. This device was designed primarily for direct broadcasting by satellite (DBS) services and operates up to 45 Mb/s. The STEL-2060 uses industry standard, constraint length 7, polynomials and incorporates depuncturing circuitry to allow it to be u... View full abstract»

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  • A versatile, broadband, low-profile antenna

    Publication Year: 1993, Page(s):227 - 231
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    The recently invented spiral-mode microstrip (SMM) antenna is finding application in various commercial systems as well as various military systems in addition to the military application for which it was developed. The salient features of this antenna are reviewed with respect to those applications for which interest in the antenna has been strongest. The salient features of the new antenna are b... View full abstract»

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  • On the processing gain and pulse compression ratio of frequency hopping spread spectrum waveforms

    Publication Year: 1993, Page(s):215 - 219
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The authors consider the pulse compression ratio and processing gain of frequency hopping spread spectrum waveforms. The importance of the frequency separation-subpulse width product is studied. Typical autocorrelation functions for coherent and noncoherent frequency hopping systems are given View full abstract»

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  • A comparative study of JPEG and residual VQ compression of radar imagery

    Publication Year: 1993, Page(s):203 - 207
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The Joint Photographic Expert Group (JPEG) compression standard and a type of vector quantization called residual vector quantization (RVQ) are evaluated for the real-time compression of precision approach radar (PAR) video data. Experimental results obtained from simulated PAR imagery are presented which allow a performance and complexity comparison of the two compression methods. For low to mode... View full abstract»

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  • Modern cable TV network, the ideal platform for PCS

    Publication Year: 1993, Page(s):59 - 64
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Modern cable TV distribution plants offer many advantages in providing personal communication services (PCS) to the public. The author reviews the evolution of cable TV architectures from an all coaxial cable tree and branch to a fiber-rich double star network. The cable TV industry has invested considerable capital and resources to improve the reliability and the quality of their distribution pla... View full abstract»

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  • Autonomous precision approach and landing system APALS

    Publication Year: 1993, Page(s):101 - 107
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    The autonomous precision approach and landing system (APALS) system is a precision approach and landing system designed to enable low-visibility landings at many more airports than is now possible. It is an autonomous navigation system which uses standard avionics equipment to determine the aircraft position and altitude with respect to unique terrain features over which the aircraft flies. The pr... View full abstract»

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  • Advanced RF cards for fare collection

    Publication Year: 1993, Page(s):31 - 35
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    Transit fare collection systems are discussed. The public transit industry has shown a strong interest in the value that smart cards can bring to the fare collection process. At the same time, the toll collection industry has migrated to radio frequency (RF) methods for advanced electronic toll collection and traffic management (ETTM) systems. The ideal solution to the fare collection problem may ... View full abstract»

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  • High resolution MMW seeker fuse processing

    Publication Year: 1993, Page(s):175 - 179
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    The authors describe a new signal processing technique for phased arrays that can be used in near-field target imaging. This processing technique is useful to millimeter wave seekers employing planar phased arrays as a new approach to performing warhead fusing. The array operation and signal processing are similar to synthetic sampled aperture radar (SSAMAR). Through a coherent integration of all ... View full abstract»

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  • Microwave optics for space and ground communications

    Publication Year: 1993, Page(s):1 - 6
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    Fiber optic and free space laser communications operating in microwave and millimeter-wave (M/MM) frequencies provide numerous advantages. Various M/MMW fiber optic and lasercom system applications, including satellite communications, phased-arrays, and antenna remotings for cellular/wireless/personal communications are described. Commercially available and state-of-the-art key components required... View full abstract»

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  • The search and rescue communications channel-past, present and future

    Publication Year: 1993, Page(s):131 - 138
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    From a macroscopic viewpoint, the underlying concept for search and rescue (SAR) involving radio beacons is a communications channel. The communications channel should establish a two-way link by providing confirmation of the message received. The author outlines the different aspects of the SAR communications channel from its very beginnings to the current COSPAS-SARSAT satellite system, and he a... View full abstract»

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